VIDEO: 16-year-old girl knocked unconscious on London sidewalk

Police in London have released graphic video of a teenager being knocked unconscious in an apparent random act of violence at mid-day.

The attack occurred in Plaistow, east London, last Tuesday around 12:30 p.m., the Daily Mail reported in a story headlined: "Is this the most brutal thug in Britain?"

In the video taken by a closed-circuit TV camera, the attacker, who appears to be around 25 to 30-years-old, takes a massive swing with his right fist from behind, throwing the girl to the pavement and knocking her out.

The Mail said the 16-year-old was treated at a hospital with bruises and cuts to her head and face, but was released the same day after a series of tests.

The unidentified victim told London24 that she could not remember the incident and simply woke up with a bad migraine in the ambulance.